When young athletes sustain concussions, they are typically told to rest until all symptoms disappear. That means no physical activity, reading, screen time, or friends, and little light exposure, for multiple days and, in severe cases, weeks.

Restricting all forms of activity after a concussion is known as “cocooning.” But now new guidelines, written by an international panel of concussion experts and published this month in the British Journal of Sports Medicine, question that practice. Instead of cocooning, the new guidelines suggest that most young athletes should be encouraged to start being physically active within a day or two after the injury.

“The brain benefits from movement and exercise, including after a concussion,” says Dr. John Leddy, a professor of orthopedics at the Jacobs School of Medicine and Biomedical Sciences at the University at Buffalo, and one of the co-authors of the new guidelines.

There has long been controversy, of course, about the best ways to identify and treat sports-related concussions. Twenty years ago, athletes who banged their heads during play were allowed to remain in the practice or game, even if they stumbled, seemed disoriented, or were “seeing stars.” Little was known then about any possible immediate or long-term consequences from head trauma during sports or about the best responses on the sidelines and afterward.

Since then, mounting evidence has indicated that sports-related concussions are not benign and require appropriate treatment. The question has been what these appropriate treatments should be.

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Jeffrey R. Ungvary President